The Paterson film from 1967 has been investigated six ways to Sunday and has not been debunked. A Bigfoot series on TV has shown a police dashcam vid of one crossing a road, and another video of one partly visible in a wooded area. These have been scientifically analyzed and do not appear to be hoaxes due to factors like movement, stride length, etc. that a human could not match.
And they may very well bury their dead, or at least conceal them somewhere.
If I see one I'll try to overcome my wonderment and pull the trigger, then call 911 and wait to be arrested. < /sarc >
One possibility to consider is that Bigfoot is alien. Somebody must be flying all those UFOs that are sighted. This would explain also the lack of any corpses or bones; the Bigfoot dead are transported back to Kashyyyk for burial.